Malachite(孔雀石):Cu2CO3(OH)2 Malachite the mineral is basic carbonate of copper, usually described as a bright greenish blue or sometimes as a pale green.This malachite is a fine grade with an average particle size of 20 μ that exhibits a light green masstone with a slightly yellowish undertone.Toxicity:Malachite is moderately toxic and care should be used in handling the dry powder pigment to avoid inhaling the dust .